I must correct my earlier post on Pete's question - faulty memory on my part
regarding the actual failed part in LA7NO's K3 T/R switch. It was NOT the
PIN diode D25, but was instead the RF choke (RFC30) that provides
the DC path to ground that enables the 7T or 7R control voltages to select
the
Pete;
Always do what the master says. Keith knowns more about the K3 than almost
anyone.
That 3db figure stands out for me, though. For a component failure or a
misadjustment I would expect something else. This sounds more like the antenna
is being split, going to another place along with the
Hi Pete;
RF gain up?
Adjust width to click thru all filters.
Does ATT/Pre change the sensitivity? (if not, it could be something in
that circuit).
Try the RX antenna BNC input (if KXV3 equipped).
Try Ant 2 (if KAT3 equipped).
If good at RX ant, then most likely D26 or 27 on RF board.
If bad at
I have had a similar loss of RX on my K3S. It is cured by turning the
RF control down and then back up. I don't know what causes this and
whether it is hardware or software related. A twist of the knob is all
it takes to fix so I live with it.
Buck, k4ia
Honor Roll
8BDXCC
Plus one on the TMP connectors. It has happened to me a couple of
times over the years. A little dab of Deoxit and move it around a bit
when re-installing seems to do the trick.
Richard
K6VV
On 2/23/2021 5:40 AM, Mike K8CN wrote:
Pete,
There was a similar report on the forum last year
Pete,
There was a similar report on the forum last year from Per-Tore, LA7NO. In
an extended email conversation we deduced his problems were caused by failed
PIN diodes in one of the T/R switches, which ultimately proved to be the
case. His K3 also lost TX power, unlike your situation, so you
Yesterday afternoon, I thought the bottom had dropped out of the bands,
because everything was puny weak, yet I was still working people with
about the usual success rate. After I finished the contest, I dug out
my XG3, and checked the sensitivity on each band - in all cases, 160-10,
the K3
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